Profile for a cylindrical component

Abstract

A cylindrical component has a groove bottom (4) that extends approximately parallel to the course of the unworked surface of the component, and has a side wall (6, 7) inclined at an angle (α) of less than 90° to the groove bottom (4). To increase the adhesion between a coating to be applied to the surface of the component an upper region of the side wall (6, 7) is adjoined by an oblique surface (8, 9) at an angle (ψ) of greater than 90° to the side wall.

What is claimed is: 
     
       1. A cylindrical component having an inner cylindrical surface formed around a central axis and a helical groove formed in the cylindrical inner surface, the groove having a profile that consists of: a groove bottom that extends substantially parallel to the surface of the component into which the groove is formed, the groove bottom having opposite first and second lateral ends, first and second side surfaces aligned at an angle (α) of less than 90° to the groove bottom, first and second oblique surfaces extending out from the respective first and second side surfaces at angles (ψ) to the side surfaces greater than 90° so that the oblique surfaces converge continuously toward one another at positions farther from the central axis, and first and second steps between the respective first and second lateral ends of the groove bottom and the respective first and second side surfaces, the steps being closer than the groove bottom to the oblique surfaces and a distance between the first and second steps being less than a distance between the locations on the side surfaces closest to the groove bottom, wherein the steps relieve stress on a tool that forms the groove and wherein the converging oblique surfaces cause particles that strike the oblique surfaces to be guided to the groove bottom, and wherein the helical groove comprises plural groove sections that are next to one another at a constant spacing in a direction parallel to the central axis, the oblique surfaces of the groove sections that are next to one another in the direction parallel to the central axis intersecting and meeting one another at a convex angle of intersection (ξ) that is greater than 90° and that is free of concavities facing toward the central axis so that particles striking the oblique surfaces are guided to the groove bottom. 
     
     
       2. The component of  claim 1 , wherein dimensions of the oblique surfaces in directions normal to the intersection of the oblique surfaces are equal at all positions on the respective groove profiles. 
     
     
       3. A cylindrical component having an inner cylindrical surface formed around a central axis and a helical groove formed in the cylindrical inner surface, the groove having a profile that consists of: a groove bottom that extends substantially parallel to the surface of the component into which the groove is formed, the groove bottom having opposite first and second lateral ends, first and second side surfaces aligned at an angle (α) of less than 90° to the groove bottom, first and second oblique surfaces extending out from the respective first and second side surfaces at angles (ψ) to the side surfaces greater than 90° so that the oblique surfaces converge continuously toward one another at positions farther from the central axis, the helical groove having plural groove sections that are next to one another at a constant spacing in a direction parallel to the central axis, the oblique surfaces of the groove sections that are next to one another in the direction parallel to the central axis intersecting and meeting one another at a convex angle of intersection (ξ) that is greater than 90° and that is free of concavities facing toward the central axis, wherein the converging oblique surfaces cause particles that strike the oblique surfaces to be guided to the groove bottom. 
     
     
       4. The component of  claim 3 , wherein dimensions of the obliques surfaces in directions normal to the intersection of the oblique surfaces are equal at all positions on the respective oblique surfaces.